Reynolds Number Calculator — Laminar vs Turbulent Flow

Calculate Reynolds number for pipe flow, open channel flow, and external flow. Determine whether flow is laminar, transitional, or turbulent.

Fluid Velocity (m/s)
Pipe Diameter (m)
Kinematic Viscosity ν (m²/s)
Common ν: Water 20°C = 1.004×10⁻⁶ · Air 20°C = 1.516×10⁻⁵ m²/s
⟨∿⟩ Fluids Reference: All calculations use SI units (Pa, m³/s, W, K). Moody friction factor uses Blasius smooth-pipe approximation. Bernoulli assumes ideal, incompressible, steady flow along a streamline.
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How to Use

Enter the values for the patient or scenario you are assessing. Calculate Reynolds number for pipe flow, open channel flow, and external flow. Determine whether flow is laminar, transitional, or turbulent. Use the reynolds number result to inform your clinical assessment.

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Frequently Asked Questions